Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411).
Bibliographic record
Abstract
Integrated Ocean Drilling Program Expedition 342 (June-July 2012) cored nine sites and 18 \nholes (Sites U1403-U1411) on the J-Anomaly and the Southeast Newfoundland ridges in the \nNW Atlantic Ocean. These sites recovered sections ranging from Pleistocene to upper Albian, \nbut the expedition particularly focussed on the recovery of expanded Paleogene successions \nwith high quality microfossil preservation. This was achieved by choosing sites with thick \npackages of drift-type sediments on topographic highs that would maximise the preservation of \ncarbonate. The expedition suceeded in recovering middle Eocene to lower Oligocene and upper \nOligocene to lower Miocene high sedimentation rate sediment sequences with very well \npreserved microfossils. Highlights of the expedition include the recovery of continuous \nEocene/Oligocene and Oligocene/Miocene boundaries, a Cretaceous-Paleogene boundary \nsection with intact spherule layer, and Cenomanian/Turonian section with a 44 cm black shale. \nHere, we describe notable aspects of the Eocene nannofossil record, including the exceptional \npreservation and the evolution of several important Eocene groups: Nannotetrina, the \nSphenolithus furcatolithoides group, the Reticulofenestra bisecta group and the Coccolithus \ngigas group. We also present a taxonomic overview of the Eocene nannofossil assemblages \nfrom Sites U1403-1411, illustrating 164 taxa and describing 25 new species (Blackites \nfriedrichii, Blackites sextonii, Blackites subtilis, Calcidiscus scullyae, Clausicoccus norrisii, \nCoccolithus hulliae, Coccolithus opdykei, Cruciplacolithus nishii, Helicosphaera prolixa, \nHolodiscolithus agniniae, Holodiscolithus lippertii, Holodiscolithus liuii, Holodiscolithus \nwhitesideae, Nannotetrina plana, Nannotetrina ruda, Neococcolithes purus, Neococcolithes \nradiatus, Pontosphaera brinkhuisii, Pontosphaera hollisii, Pontosphaera romansii, \nPontosphaera wilsonii, Reticulofenestra magniscutum, Scyphosphaera interstincta, \nSemihololithus pseudobiskayae, Syracosphaera octiforma) and five new combinations \n(Blackites inversus, Pontosphaera zigzag, Reticulofenestra erbae, Reticulofenestra isabellae, \nUmbilicosphaera elliptica).
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.010 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".